docs(readme): update assistant roster, prompt layers, repo structure

- Update assistant lists (added Shawn, Watson, David, CASE, AWS SA; modified Scotty/Harper roles)
- Reflect new architecture layers: Tool Prompt Snippets and Shared Context
- Align repository structure diagram with current filesystem layout

docs/tools/neo4j/breaking-changes.md

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+## Neo4j Version Compatibility Notes
+
+Neo4j had significant breaking changes between version 4.x and 5.x regarding schema introspection:
+
+**Neo4j 5.x+ (current):**
+- Use `SHOW INDEXES` instead of `CALL db.indexes()`
+- Use `SHOW CONSTRAINTS` instead of `CALL db.constraints()`
+- Use `CALL db.schema.visualization()` for full schema (works in both versions)
+
+**Neo4j 4.x and earlier:**
+- Use `CALL db.indexes()`
+- Use `CALL db.constraints()`
+
+**Safe queries that work across versions:**
+- `CALL db.schema.visualization()` - Full schema visualization
+- `CALL db.labels()` - Get all node labels
+- `CALL db.relationshipTypes()` - Get all relationship types
+
+When querying indexes or constraints, prefer the `SHOW` commands for Neo4j 5+ environments.